Novel quadruple-shelled hollow Zn0.5Mn0.5Co2O4/RGO heterostructure enable rapid and stable lithium storage performance

Yang, Chenyu; Li, Xiuyan; Gao, Tingting; Gu, Shaonan; Wang, Xiao; Wang, Yinan; Wang, Qian; Sun, Bin; He, Yanyan; Zhou, Guowei

doi:10.1016/j.cej.2023.145818

Cited by 4 publications

(1 citation statement)

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“…31,33 The synthesis of CaGe 2 involved the fusion of the respective elements following a documented method. 35 Powder X-ray diffraction (XRD) analysis revealed a diffraction pattern matching the standard hexagonal CaGe 2 (PDF # 13-0299), with trace germanium contaminants (Figure S1a). The CaGe 2 was converted to van der Waals bonded GeH, evidenced by powder XRD, FTIR, and Raman spectroscopic analyses.…”

Section: Resultsmentioning

confidence: 99%

Topological Transformation of Hydrogen-Terminated Germanium to Germanium Nanosheets for Fast Lithium Storage

Xu,

Lu,

et al. 2024

ACS Appl. Mater. Interfaces

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Germanium has been recognized as a promising anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity and excellent lithium-ion diffusivity. Nonetheless, it is challenging to enhance both the high-rate performance and long-term cycling stability simultaneously. This study introduces a novel heterostructure composed of germanium nanosheets integrated with graphene (Ge NSs@Gr). These nanosheets undergo an in situ phase transformation from a hydrogen-terminated multilayer germanium compound termed germanane (GeH) derived via topochemical deintercalation from CaGe 2 . This approach mitigates oxidation and prevents restacking by functionalizing the exfoliated germanane with octadecenoic organic molecules. The resultant germanium nanosheets retain their structural integrity from CaGe 2 and present an exposed, active (111) surface that features an open crystal lattice, facilitating swift lithium-ion migration conducive to lithium storage. The composite material delivers a substantial reversible capacity of 1220 mA h g −1 at a current density of 0.2 C and maintains a capacity of 456 mA h g −1 even at an ultrahigh current density of 10 C over extended cycling. Impressively, a capacity of 316 mA h g −1 remains after 5000 cycles. The exceptional high-rate performance and durable cycling stability underscore the Ge NSs@Gr anode's potential as a highly viable option for LIBs.

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Section: Resultsmentioning

confidence: 99%